To calculate the density of an object, you would need to know the mass and volume of the object.
What is density?The density of an object is the ratio of the mass of the object to that of its volume.
In other words, density = mass/volume.
Thus, in order to calculate the density of an object, both its mass and its volume must be known or given.
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HCl + Fe + ____ + H²
Simple Way.
Hydrochloric acid + iron --> ______ + hydrogen gas.
• Answer this question, only if you know.
• Misuse of points will cost a report.
Answer:
This is a correct answer. 2HCL + Fe = FeCl2 + H2
Which two substances are among the six most abundant elements in living
things?
A. Potassium
B. Phosphorus
DC Sodium
D. Oxygen
Answer:
B and D
Explanation:
6 abundant elements-
1. oxygen
2. carbon
3. hydrogen
4. nitrogen
5. sulfur
6. phosphorus
Answer:
Phosphorus and Oxygen
Explanation:
Carbon is the most abundant element in our universe then comes oxygen then comes hydrogen.
Sulfur and nitrogen are also counted among most abundant elements
Option B and D are correct
The temperature of 150 mL of water is 25°C. What must happen for the
temperature of the water to increase to 35°C?
A. Water must be removed to decrease the thermal energy.
OB. More water must be added to increase the thermal energy.
C. Thermal energy must be transferred to the water to increase the
average kinetic energy of the water molecules.
D. Thermal energy must be transferred from the water to decrease
the average kinetic energy of the water molecules.
Which statement is true of magnets
The statement that is true about magnets is ''Similar poles of a magnet repel each other.''
What are the characteristics of magnet?All magnets have both north and south poles. Opposite poles attract each other, whereas the similar poles repel each other. When you rub a piece of iron along a magnet, this force creates a magnetic field.
So we can conclude that The statement that is true about magnets is ''Similar poles of a magnet repel each other.''
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differentiate between electrolytic and metallic conductors.
[tex] \\ [/tex]
ty! ~
Explanation:
Metallic conductors contain free electron for conduction of electricity and is a good conductor of heat and electricity
electrolytic conductors contain ions for conduction
Which of the following is best described as an acid-base reaction?
O HNO3(aq) + NH3(aq) → NH4*(aq) + NO3(aq)
O P4(s) + 3OH (aq) + 3H3O(1)→ PH3(g) + 3H₂PO₂ (aq)
O Cu(s) + H₂S(g) → CuS(s) + H₂(g)
O 2H₂(g) + O2(g) → 2H₂O(l)
O 2KCIO3(aq) → 2KCI(s) + 302(g)
The reaction which represents an acid-base reaction is: HNO3(aq) + NH3(aq) → NH4*(aq) + NO3(aq).
What is an acid-base reaction?An acid-base reaction is a reaction in which a substance donate protons to another substance which then accepts the proton.
An acid-base reaction usually involves the formation of a salt.
From the given reactions, the acid-base reaction is given below:
HNO3(aq) + NH3(aq) → NH4*(aq) + NO3(aq)In the given reaction, HNO3 donates a proton and NH3 accepts the proton.
Therefore, the reaction which represents an acid-base reaction is: HNO3(aq) + NH3(aq) → NH4*(aq) + NO3(aq).
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Use Charles's Law to interpret the following problem and then select the correct answer below.
A 250mL compressed tank is filled with Hydrogen gas and has a pressure of 100kPa. If all of the Hydrogen gas is removed from the tank and pumped into a 1L tank what happens to the temperature of the gas?
Question 2 options:
The temperature in the 1 L tank increases.
The temperature in the 250 mL tank decreases.
All of the above.
None of the above.
The temperature in the 250 mL tank increases.
Considering the Charles's Law, the temperature in the 1 L tank increases.
What is the Charles's LawCharles' Law consists of the relationship that exists between the volume and the temperature of a certain amount of ideal gas, which is maintained at a constant pressure.
This law determines that for a given sum of gas at a constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases because the temperature. That is, the volume is directly proportional to the temperature of the gas.
Mathematically, Charles' law is a law that says that when the amount of gas and pressure remain constant, the ratio between volume and temperature will always have the same value:
[tex]\frac{V}{T} =k[/tex]
Analyzing an initial state 1 and a final state 2, the following is true:
[tex]\frac{V1}{T1} =\frac{V2}{T2}[/tex]
Temperature of the gas in this caseAccording to Charles' law, the volume is directly proportional to the temperature of the gas. So if the volume increases from 250 mL to 1 L, the temperature will also increase.
This is, the temperature in the 1 L tank increases.
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5. What does a positively charged ion indicate in terms of its subatomic particles? Use the
Calcium ion Cat2 as a specific example in your explanation.
Answer: A positively charged ion means that there are more protons than electrons. For example, the calcium ion has 2 more protons than electrons.
Please HELP!!!! Im stuck!
The enthalpy of the reaction, [tex]S_{(s)} + O_{2}_{(g)} \rightarrow SO_{2}_{(g)}[/tex], ΔH is -197 kJ.
What is the enthalpy change of the reaction?The enthalpy change of a reaction, ΔH, is the heat absorbed or given off when reactants form products for a given reaction.
The enthalpy change, ΔH, of the reaction given below:
[tex]S_{(s)} + O_{2}_{(g)} \rightarrow SO_{2}_{(g)}[/tex]
The enthalpy change is calculated from the intermediate reactions:
[tex]S_{(s)} + \frac{3}{2}\:O_{2}_{(g)} \rightarrow SO_{3}_{(g)} \:\Delta H_{1} = -395.2 \:kJ\\SO_{3}_{(g)}\rightarrow SO_{2}{(g)} + \frac{1}{2}O_{2}_{(g)} \:\Delta H_{2} = 198.2\:kJ[/tex]
ΔH = ΔH₁ + ΔH₂
ΔH = -395.2 + 198.2 kJ
ΔH = -197 kJ
Therefore, the enthalpy of the reaction, [tex]S_{(s)} + O_{2}_{(g)} \rightarrow SO_{2}_{(g)}[/tex], ΔH = -197 kJ.
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A certain chemical reaction telesales 24.7 kk/g of heat for each gram of reactant consumed
The mass of reactant that would produce 800 Joules of heat is equal to 800 J × (1 kJ/1000 J)/(24.7 kJ/g).
How to calculate the mass of reactant?In order to determine the mass of reactant that would produce 800 Joules of heat, we would set up a conversion equation as follows:
Note: 1 kJ is equal to 1000 Joules.
Conversion:
1 gram = 24.7 kJ
X gram = 800 Joules
Therefore, the mass of reactant that would produce 800 Joules of heat is given by:
Mass = Heat × (conversion factor/rate of heat)
Mass = 800 J × (1 kJ/1000 J)/(24.7 kJ/g).
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Complete Question:
A certain chemical reaction releases 24.7 kJ/g of heat for each gram of reactant consumed. How can you calculate what mass of reactant will produce 800 Joules of heat?
48g of 02 produce how many grams of Al2O3
Taking into account the reaction stoichiometry, 102 grams of Al₂O₃ are formed when 48 grams of O₂ react.
Reaction stoichiometryIn first place, the balanced reaction is:
4 Al + 3 O₂ → 2 Al₂O₃
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Al: 4 moles O₂: 3 molesAl₂O₃: 2 molesThe molar mass of the compounds is:
Al: 27 g/moleO₂: 32 g/moleAl₂O₃: 102 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Al: 4 moles ×27 g/mole= 108 gramsO₂: 3 moles ×32 g/mole= 96 gramsAl₂O₃: 2 moles ×102 g/mole= 204 gramsMass of Al₂O₃ formedThe following rule of three can be applied: if by reaction stoichiometry 96 grams of O₂ form 204 grams of Al₂O₃, 48 grams of O₂ form how much mass of Al₂O₃?
[tex]mass of Al_{2} O_{3} =\frac{48 grams of O_{2} x204 grams of Al_{2} O_{3}}{96 grams of O_{2}}[/tex]
mass of Al₂O₃= 102 grams
Finally, 102 grams of Al₂O₃ are formed when 48 grams of O₂ react.
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100 Points} Name the following compounds from the structures given (images shown below)
1.
2.
3.
4.
5.
6.
Unfortunately, they're not multiple choice, so I have no possible answers to list, I believe 1. might be "2-methylhexane" but I'm unsure how to write the double bond that's shown in the structure, thanks! :)
Edit; the screenshots posted out of order, my apologies :(
Answer:
1.) There are 6 carbons in the longest possible parent chain (hex-). Since there is a double bond, this is an alkene. The lowest possible carbon the double bond consists of is the 2nd carbon. There is also a methyl group on the 2nd carbon. All together, this makes the structure: 2-methyl-2-hexene.
2.) There are 9 carbons in the longest possible parent chain (non-). The lowest possible carbons the methyl groups are on are the 3rd and 5th carbons. The lowest possible carbon the ethyl group is located on is the 4th carbon. Remember, branches are listed alphabetically. All together, this makes the structure: 4-ethyl-3,5-dimethylnonane.
3.) There are 7 carbons in the longest possible parent chain (hept-). There is a triple bond, making this an alkyne. The lowest possible carbon the triple bond consists of is the 2nd carbon. The lowest possible carbon the methyl group is on is the 4th carbon. All together, this makes the structure: 4-methyl-2-heptyne.
4.) There are 10 carbons in the longest possible parent chain (dec-). The lowest possible carbon the propyl group is on is the 5th carbon. All together, this structure is: 5-propyldecane.
5.) There are 4 carbons in the longest possible parent chain (but-). The lowest possible carbon the methyl group is on is the 2nd carbon. All together, this makes the structure: 2-methylbutane.
6.) There are 5 carbons in the longest possible parent chain (pent-). There is a double bond, making the molecule an alkene. The lowest possible carbon the double bond consists of is the 2nd carbon. The lowest possible carbon the methyl group is on is the 2nd carbon. All together, this makes the structure: 2-methyl-2-pentene.
If another student joins the game and stands behind the two students
already in the game, how will the game be changed?
Answer:
ha djd sidi dj sjejeisns
Which type of fault would you
find at a divergent boundary?
A. normal fault - hanging wall moves down
relative to footwall
B. hanging fault - both walls hung up and do not
move
C. reverse fault - hanging wall moves up relative
to footwall
D. strike-slip fault - fault walls slide side by side
Name the following alkyne: CH3CH₂C = CCH₂CH₂CH3
B. 3-heptyne
D. 3-heptene
A. 4-heptyne
C. 3-heptane
The given alkyne is Option A 3-heptyne
What is an Alkyne ?The hydrocarbon having at least one C-C triple bond is called an Alkyne.
It has the general formula of [tex]\rm C_n H_{2n+2}[/tex] .
In the question it is being mentioned that it is an alkyne so there will be a triple bond and not a double bond.
It has been asked in the question that
CH3CH₂C ≡ CCH₂CH₂CH3 is which alkyne from the given option.
The counting of the Carbon chain is done from the left side and the Triple bond is at the 3rd Carbon , so 3-heptyne .
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Which is the correct name for the substance shown
in the diagram?
HH
H-C=C-H
ethanol
ethyne
ethane
ethene
Answer: 4
Explanation:
There is a double covalent bond between the carbon atoms of the hydrocarbon, so the ending must be 'ene'.
Every spring has an equilibrium position. Which statements describe a spring at its equilibrium position? Check all that apply.
The spring constant is zero.
The elastic potential energy is at a maximum.
The elastic potential energy is zero.
The displacement of the spring is at a maximum.
The net force acting on the spring is zero.
The statements describe a spring at its equilibrium position is the elastic potential energy is zero, the displacement of the spring is at a maximum and the net force acting on the spring is zero.
What is the equilibrium position?
A body is in equilibrium when the sum of all forces acting on it equals zero. According to Newton's First Law, when resulting from the laws that act on a body that remains in a state of restriction or in motion in its motion, it remains uniformly null.
In this case the only statements that match the definition of equilibrium position are:
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What is the volume of the rectangular prism shown below?
A. 250 in 3
B. 90 in 3
C. 19 in ³
D. 200 in 3
If 12 gallons of gasoline cost $34.68, what is the unit price per gallon?
I know the subject is off can somebody who knows how to do this solve this for me?
Which of the following is NOT an example of a tension force?
O tug of war
O towing a car
O magnets
O pulling a bucket from a well
↓
Answer:
Magnets
Explanation:
magnets donot require tension force
when you eat food, where does digestion begin do physical and chemical changes happen in mouth how?
The process of digestion begins in the mouth with the intake of food. The teeth play an important role in masticating (chewing) or physically breaking food into smaller particles. The enzymes present in saliva also begin to chemically break down food.
Explanation:
#CarryOnLearningWhat is the molarity of 985 mL solution with 0.81 moles KF?
M
Please help I need it done tonight
Answer:
0.82 M
Explanation:
You have been given moles and volume (in mL). To find the molarity of the solution, you need to (1) convert mL to L and then (2) plug moles and volume into the molarity formula.
985 mL / 1,000 = 0.985 L
Molarity (M) = moles / volume (L)
Molarity = 0.81 moles / 0.985 L
Molarity = 0.82 M
What happens when the density of a medium increases?
Bending of light decreases
Bending of light increases
Temperature of light increases
Temperature of light decreases
Answer:
B.
Explanation:
The amount of space between the particles in a medium reduces as its density rises, which causes light to bend. 2. This impact is highest for light that is close to the medium's surface and weakest for light that is far away from the medium's surface.
What is the length of the paper clip in cm
Answer:
24.5 cm
Explanation:
It would be really complicated to type out, so I've attached an image of how I solved this:
*I separated the paperclip into different sections, figured out the length of those sections, and added them together.
(sorry that my work isn't the neatest)
a mole of pennies would fill up how many 32oz cups?
Answer:
4 cups?
Explanation:
Calcium oxide + strontium hydroxide →
Answer:
Calcium oxide + strontium hydroxide → Portlandite + strontium oxide.
ie... Cao+ Sr(oH)2 = CA (oH)2+ Sro
Which of these is a primary characteristic used to describe a clastic sedimentary rock?
A. Types of shells
B. Minerals present
C. Size of the rock
D. Grain size
Which of these would a chemist most likely study?
Which type of fuel contributes the most to smog
What happens when a train comes to a stop
why a ball rolls down hill
Which animals can see in the dark
A chemist most likely study which type of fuel contributes the most to smog.
Who is a chemist?A chemist is a scientist who majors in or studies chemistry.
A chemist studies the composition of matter, the changes that matter undergo as well as the properties and uses of matter.
Matter can undergo physical or chemical changes.
The consumption of fuels and how they affect the environment will be of interest to a chemist.
Therefore, a chemist most likely study which type of fuel contributes the most to smog.
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A chemist uses 22.0 mL of 0.10 M H₂SO4 to neutralize 10.0 mL of NaOH. What is the concentration of the NaOH solution?
2 A 044M
OB. 0.22 M
O C 0.11 M
OD. 0.055 M
The concentration of the NaOH solution required for the reaction given the data is 0.44 M
Balanced equationH₂SO₄ + 2NaOH —> Na₂SO₄ + 2H₂O
From the balanced equation above,
The mole ratio of the acid, H₂SO₄ (nA) = 1The mole ratio of the base, NaOH (nB) = 2How to determine the concentration of NaOHVolume of acid, H₂SO₄ (Va) = 22 mL Concentration of acid, H₂SO₄ (Ca) = 0.1 MVolume of base, NaOH (Vb) = 10 mLConcentration of base, NaOH (Cb) =?CaVa / CbVb = nA / nB
(0.1 × 22) / (Cb × 10) = 1 / 2
2.2 / (Cb × 10) = 1 / 2
Cross multiply
Cb × 10 = 2.2 × 2
Cb × 10 = 4.4
Divide both side by 10
Cb = 4.4 / 10
Cb = 0.44 M
Thus, the concentration of the NaOH solution is 0.44 M
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5. For the equilibrium
Br2(g) + Cl2(g) 2 BrCl(g)
At 400K, Kc=7.0. If 0.050M Br2 and 0.050 M Cl2 are introduced into a container at 400K, what will be the equilibrium concentrations of Br2, Cl2, and BrCl?
The reaction quotient of the reaction is 7.00238.
From the question.
BrCl2 is 0.004150
Br is 0.003660
Cl is 0.00067210
Q={BrCl2}/{Br}{CL2}
Q=0.004150^2/(0.0036660)(0.00067210)
Q= 7.00238
What is equilibrium?Equilibrium of chemical reaction is the process in which the reaction remain constant and it is either moving backward or forward.
Therefore, The reaction quotient of the reaction is 7.00238
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